The WD MyBook 8TB were all the rage a few months ago among the datahoarders, they were buying them by the dozen, shucking them, and installing them into their NAS.
https://www.amazon.com/Book-Desktop-External-Drive-WDBBGB0080HBK-NESN/dp/B01LQQHLGC?th=1
Aparently, the 8TB and higher capacities are in fact relabelled WD reds, or HGST He8, I don't remember... at half the price. (150$)
They have a 3 year warranty, which is longer than others.
The 6TB and lower have WD blues or something inside I believe....
I bought one, voided the warranty by extracting the HDD, and I'm using it as an internal HDD at the mo.
Some people said they were, but they seem to put in whatever they have spare. The vast majority of them turned out to be WD white drives, and none of them were He drives- just regular non-sealed air drives for the 8TB models.
Even the ones that had the HGST drives, as it turned out, didn't have the tighter HGST manufacturing specs. They even slowed down the drives to meet the longevity and cost goals. It sucks because Hitachi (HGST) drives have been my go-to products for years.
Everything is still up in the air after the acquisition. Will they just use the lower-performing drives in external enclosures, and send the better ones for internal drives? (Manufacturers have done this for years.) All of their weird actions lately have me worried about HGST. But, as always with drives, it's all just speculation. We won't really know the real data until they have been out for a few years... at which point the data is of limited use because models are generally replaced or otherwise unavailable by then.
That being said, even the lower-tier drives have been doing well as far as longevity goes, so it might not matter all that much, especially if you're doing just a few drives. Even with quite poor drives, 75% of them will be functional after a few years.
Also, what Halcyon said is correct about RAID and consumer drives. It's unfortunate because it's forced- there no real reason, other than them wanting to charge more for the firmware capability. But you can still just use full backups with non-RAID drives, for example.